package _12interface;

public class Demo {
}
interface IA{
    int a=1;
    public abstract void walk();

}
interface IB{

}
interface IC{

}
class AA{

}
class A extends AA implements IA{
    public void walk(){

    }

}
class B implements IA{
    public void walk(){

    }


}
class C implements IA,IB,IC{
    public void walk(){

    }

}